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There are substances that are classified as bases, but they are not Arrhenius bases. For instance, ammonia(NH3) is a basic substance, but it is not an Arrhenius base because it does not release hydroxide ions into solution.

Explanation:

According to Arrhenius concept:

A base is defined as a substance which donates hydroxide ions [tex](OH^-)[/tex] when dissolved in water. For example: sodium hydroxide (NaOH), potassium hydroxide (KOH).

[tex]BOH(aq)\rightarrow B^+(aq)+OH^-(aq)[/tex]

An acid is defined as a substance which donates hydronium ions [tex](H_3O^+)[/tex] in water.For example: hydrogen chlorde (HCl), nitric acid ([tex]HNO_3[/tex]).

[tex]HA(aq)+H_2O(l)\rightarrow H_3O^++(aq)+A^-(aq)[/tex]

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